<?php

namespace App\Controllers;

use Framework\Database;
use Framework\Validation;
use Framework\Session;
use Framework\Authorisation;
use Framework\Middleware\Authorise;
class ListingController
{
    protected $db;

    public function __construct()
    {
        $config = require basePath('config/db.php');
        $this->db = new Database($config);
    }

    /**
     * 展示所有岗位
     * 
     * @return void
     */
    public function index()
    {
        $listings = $this->db->query('SELECT * FROM listing ORDER BY created_at DESC')->fetchAll();

        loadView('listings/index', [
            'listings' => $listings
        ]);
    }

    public function create()
    {
        loadView('listings/create');
    }

    /**
     * 展示单一岗位页面
     * 
     * @return void
     */
    public function show($params)
    {
        $id = $params['id'] ?? '';

        $params = [
            'id' => $id
        ];

        $listing = $this->db->query('SELECT * FROM listing WHERE id = :id', $params)->fetch();

        if (!$listing) {
            ErrorController::notFound('该岗位不存在!');
            return;
        }

        loadView('listings/show', [
            'listing' => $listing
        ]);
    }

    /**
     * 在数据库中存储数据
     * 
     * @return void 该函数没有返回值
     */
    public function store()
    {
        $allowedFields = ['title', 'description', 'salary', 'tags', 'company', 'address', 'city', 'province', 'phone', 'email', 'requirements', 'benefits'];

        $newListingData = array_intersect_key($_POST, array_flip($allowedFields));

        $newListingData['user_id'] = Session::get('user')['id'];

        $newListingData = array_map('sanitize', $newListingData);

        $requiredFields = ['title', 'description', 'email', 'city', 'province'];

        $errors = [];
        foreach ($requiredFields as $field) {
            if (empty($newListingData[$field]) || !Validation::string($newListingData[$field])) {
                $errors[$field] = ucfirst($field) . ' 为必需项';
            }
        }

        if (!empty($errors)) {
            loadView('listings/create', [
                'errors' => $errors,
                'listing' => $newListingData
            ]);
        } else {
            $fields = [];

            foreach ($newListingData as $field => $value) {
                $fields[] = $field;
            }

            $fields = implode(', ', $fields);

            $values = [];

            foreach ($newListingData as $field => $value) {
                if ($values === '') {
                    $newListingData[$field] = null;
                }
                $values[] = ':' . $field;
            }

            $values = implode(', ', $values);

            $query = "INSERT INTO listing ({$fields}) VALUES ({$values})";

            $this->db->query($query, $newListingData);

            Session::setFlashMessage('success_message','已成功创建职位!');

            redirect('/listings');
        }
    }

    /**
     * 删除一个列表项
     * 
     * @param array $params 包含必要参数的数组，如列表的ID。
     * @return void 该方法没有返回值
     */
    public function destroy($params)
    {
        $id = $params['id'];

        $params = [
            'id'=> $id
        ];

        $listing = $this->db->query('SELECT * FROM listing WHERE id = :id', $params)->fetch();

        if (!$listing) {
            ErrorController::notFound('职位不存在!');
            return;
        }

        if (!Authorisation::isOwner($listing->user_id)) {
            inspect($_SESSION);
            Session::setFlashMessage('error_message','你没有权限删除此职位!');
            return redirect('/listings/' . $listing->id);
        }

        $this->db->query('DELETE FROM listing WHERE id = :id', $params);

        Session::setFlashMessage('error_message','删除职位成功!');

        redirect('/listings');
    }

    /**
     * 显示列表项编辑表单
     * 
     * @param array $params 包含必要参数的数组，例如列表项的ID。
     * @return void 该方法没有返回值
     */
    public function edit($params) {
        $id = $params['id'] ?? '';

        $params = [
            'id'=> $id
        ];

        $listing = $this->db->query('SELECT * FROM listing WHERE id = :id', $params)->fetch();

        if (!$listing) {
            ErrorController::notFound('职位不存在！');
            return;
        }

        if (!Authorisation::isOwner($listing->user_id)) {
            Session::setFlashMessage('error_message','你没有权限修改此职位!');
            return redirect('/listings/' . $listing->id);
        }

        loadView('listings/edit', [
            'listing' => $listing
        ]);
    }
    /**
     * 更新列表项数据
     * 
     * @param array $params 包含必要参数的数组，例如列表项的ID。
     * @return void 该方法没有返回值，成功执行会重定向，失败则重新加载编辑视图。
     */
    public function update($params){
        $id = $params['id'] ?? '';

        $params = [
            'id'=> $id
        ];

        $listing = $this->db->query('SELECT * FROM listing WHERE id = :id', $params)->fetch();

        if (!$listing) {
            ErrorController::notFound('职位不存在！');
            return;
        }

        if (!Authorisation::isOwner($listing->user_id)) {
            Session::setFlashMessage('error_message','你没有权限修改此职位!');
            return redirect('/listings/' . $listing->id);
        }

        $allowedFields = ['title', 'description', 'salary', 'tags', 'company', 'address', 'city', 'province', 'phone', 'email', 'requirements', 'benefits'];

        $updateValues = array_intersect_key($_POST, array_flip($allowedFields));

        $updateValues = array_map('sanitize', $updateValues);

        $requiredFields = ['title', 'description', 'salary', 'email', 'city', 'province'];

        $errors = [];

        foreach ($requiredFields as $field) {
            if (empty($updateValues[$field]) || !Validation::string($updateValues[$field])) {
                $errors[$field] = ucfirst($field) . ' 为必需项！';
            }
        }

        {
            if (!empty($errors)) {
                loadView('listings/edit', [
                    'listing' => $listing,
                    'errors'=> $errors
                ]);
                exit;
            } else {
                $updateFields = [];
                foreach (array_keys($updateValues) as $field) {
                    $updateFields[] = "{$field} = :{$field}";
                }

                $updateFields = implode(", ", $updateFields);

                $updateQuery = "UPDATE listing SET $updateFields WHERE id = :id";

                $updateValues['id'] = $id;

                $this->db->query($updateQuery, $updateValues);

                Session::setFlashMessage('success_message','职位信息已更新!');

                redirect('/listings/' . $id);
            }
        }
    }

    /**
     * 根据关键词和地点搜索列表
     * 
     * @return void 无返回值。
     */
    public function search(){
        $keywords = isset($_GET['keywords']) ? trim($_GET['keywords']) : '';
        $location = isset($_GET['location']) ? trim($_GET['location']) : '';
        
        $query = "SELECT * FROM listing WHERE(title LIKE :keywords OR company LIKE :keywords) AND (city LIKE :location OR province LIKE :location)";

        $params = [
            'keywords' => "%{$keywords}%",
            'location' => "%{$location}%"
        ];

        $listings = $this->db->query($query, $params)->fetch();

        loadView('/listings/index', [
            'listings'=> $listings,
            'keywords' => $keywords,
            'location' => $location
        ]);
    }

    
}